JP4510399B2 - Reflective optical system and projection apparatus using the same - Google Patents

Reflective optical system and projection apparatus using the same Download PDF

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JP4510399B2
JP4510399B2 JP2003102805A JP2003102805A JP4510399B2 JP 4510399 B2 JP4510399 B2 JP 4510399B2 JP 2003102805 A JP2003102805 A JP 2003102805A JP 2003102805 A JP2003102805 A JP 2003102805A JP 4510399 B2 JP4510399 B2 JP 4510399B2
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optical system
mirror
optical
light
gap
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JP2004309765A (en
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栗岡　　善昭
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Canon Inc
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Canon Inc
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Priority to EP04252074A priority patent/EP1467234B1/en
Priority to DE602004023028T priority patent/DE602004023028D1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G02B17/0884—Catadioptric systems having a pupil corrector
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/02—Catoptric systems, e.g. image erecting and reversing system
    • G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
    • G02B17/0626—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using three curved mirrors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/02—Catoptric systems, e.g. image erecting and reversing system
    • G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
    • G02B17/0647—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using more than three curved mirrors
    • G02B17/0663—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror using more than three curved mirrors off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/08—Catadioptric systems
    • G02B17/0836—Catadioptric systems using more than three curved mirrors
    • G02B17/0848—Catadioptric systems using more than three curved mirrors off-axis or unobscured systems in which not all of the mirrors share a common axis of rotational symmetry, e.g. at least one of the mirrors is warped, tilted or decentered with respect to the other elements

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)
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Description

【０００１】
【発明の属する技術分野】
本発明は液晶パネル、ＤＭＤ等の画像形成素子からの光をスクリーン等の被投影面に投影する投影光学系、特に反射面を有する投影光学系（反射光学系）及びそれを有する投影装置に関するものである。
【０００２】
【従来の技術】
複数の光学反射面からなる反射光学系をコンパクトにするための、従来の技術には光学系の光路長を短くする提案がなされている。
【０００３】
特開２００１−２２２０６３号公報（図７）では、少なくとも３枚の曲面反射ミラーを用いて光路長に対して画面対角長を適当に長くすることで、２枚の平面ミラーで折り返しが容易にしたコンパクトなリアプロジェクション光学系を提案している。
【０００４】
特開２００１−２２１９４９号公報では、４枚の反射面を用いて最終反射面からのスクリーン、レンズ系の距離の比を適当に配しかつ、折り返しのための光路長を確保ことにより折り返しミラーを配して、斜め入射光学系における、薄く、低い装置サイズの低い光学系を提案している。
【０００５】
また、別の技術として、光路に曲面鏡を配置して、光学系内部での光路の拡がりを抑えてコンパクト化する提案がなされている。
【０００６】
例えば、特願２０００−１０４０９５号公報では、３枚ないし４枚の非球面反射鏡系に加えて、スクリーン直前の反射鏡として球面反射鏡を設置し、これを加えて合計４枚ないし５枚の反射鏡から成る、リアプロジェクション式モニター用反射結像光学系を提案している。
【０００７】
特開平０７−０１３１５７公報に開示されている投射光学系では、楕円面ミラーの第１焦点に入射した光を第２焦点に導光し、楕円面ミラーの第２焦点を放物面ミラーの焦点に一致して配置し、傾けた放物面ミラーの焦点に導光された光を平行光とし、スクリーンに斜め投射した光学系を提案している。
【０００８】
【特許文献１】
特開２００１−２２２０６３号公報
【特許文献２】
特開２００１−２２１９４９号公報
【特許文献３】
特開２０００−１０４０９５号公報
【特許文献４】
特開平０７−０１３１５７号公報
【０００９】
【発明が解決しようとする課題】
しかしながら、特開２００１−２２２０６３号公報、特開２００１−２２１９４９号公報、特願２０００−１０４０９５号公報に示されるように複数枚の光学反射面を配しても、光束の出入り口が異なるため反射光学素子の光束を通すための開口を複数箇所設ける必要があり、開口分の反射ミラーの間隔を複数箇所、空けざるを得ず、光学系が大型化してしまう欠点があった。
【００１０】
また、特開平０７−０１３１５７号公報に開示されている投射光学系では、主光線以外の光線は楕円面ミラーの第１焦点を通過しないために収差が発生し、同じ光線は楕円面ミラーの第２焦点において収差が発生し、放物面ミラーに入射する際は像が拡大されているので、スクリーン上での収差も大きくなり、結像性能が著しく悪くなるという課題があった。
【００１１】
また、従来、複数の反射光学面を用いた光学系では、光線の出入りための隙間が少なくとも二箇所空いた保持機構が必要であったため強度を確保しずらい欠点があった。
【００１２】
本発明の目的は、複数の曲率を有する光学反射面を含む結像光学系において、反射光学系へ入射する際に通過する一対の光学反射面の間隙と射出する際に通過する一対の光学反射面の間隙が同じ間隙することで、反射光学系の開口部の数を減らし、大きさを小さくできることで、光学系をコンパクトにすること、保持機構の強度を確保しやすく、高性能な反射光学系を提供することを目的とする。
【００１３】
【課題を解決するための手段】
上記目的を達成するため、本出願に係る第１の発明の画像投影装置は、表示素子と、前記表示素子からの光を被投影面に投影する光学系とを有する画像投影装置であって、該光学系は、絞りと、第１、２、３、４ミラーを含み絞りからの光束を反射する反射光学系と、を備える光学系であって、絞りからの光束が、第２ミラーと第３ミラーとの間隙を介して第１ミラーに入射し、第１ミラーからの反射光が第３ミラーと第４ミラーとの間を通って第２ミラーに入射し、第２ミラーからの反射光が第３ミラーに入射し、第３ミラーからの反射光が第１ミラーと第２ミラーとの間を通って第４ミラーに入射し、第４ミラーからの反射光が間隙を介して反射光学系から射出するように反射光学系が構成されており、反射光学系が、前記絞りの像を前記第１ミラーと前記第２ミラーとの間隙、前記第２ミラーと前記第３ミラーとの間隙、前記第３ミラーと前記第４ミラーとの間隙のいずれかに配置することを特徴としている。
【００１４】
【発明の実施の形態】
（実施例１）
図１は本発明の実施例１をあらわす。１００は入射光（不図示）を変調して射出する表示素子、１０１は屈折光学系（不図示）、１０２（一点鎖線の領域）は反射光学系、１０３（点線で囲まれた反射面間の領域）は一対の光学反射面の間隙で反射光学系に光線を入出射させる開口を配置する領域を示し、１０４は保持機構を模式的にあらわす。図２は光学系の全体図。図３は、像面上のディストーションを表す。
【００１５】
光源から発せられた光束を屈折光学系１０１で屈折し、反射光学系１０２へと入射する。反射光学系１０２は、４枚の光学反射面からなり、そのうちの２枚からなる光学反射面の間隙を入射光が通過する。反射光学系１０２へ入射した光は、反射光学系１０２の内部で４回反射し、その反射光は入射光と交差している。反射光学系１０２を射出する光束は、同一の一対の光学反射面の間隙１０３で挟まれた開口を通る、つまり、入射光と同じ間隙を通過する。そのため、反射光学系を保持する保持機構の光線の通す開口が一箇所である。開口の位置、サイズは、反射光学系に出入りする光がけられないようにすればよい。
【００１６】
また、この光学系では、反射光学系の射出光束が瞳像を一対の光学反射面の間隙１０３の中で形成している。そのため、反射光学系から射出する方向の断面を光学反射面の間隙で狭めることができる。一般に光学系における遮光手段である絞りの作用は軸外光線におけるマージナル光線を遮光するビネッテイング作用があり、絞りの前後と比較し光束がくびれている。本実施例では、絞りと共役な関係にある光線のくびれた瞳像を一対の光学反射面の間隙で挟まれた領域１０３内に配置しているため、領域を形成する一対の光学反射面の面間隔を短く配置することができ、反射光学系がコンパクト化できている。なお、反射光学系に入射する直前の光束上に瞳の実像を形成すると、入射光束の径を小さくすることができるので一対の光学反射面の間隙で挟まれた領域１０３を小型化できる。
【００１７】
また、反射光学系から射出する光束上に遮光手段と共役な像を有する、さらには、遮光手段と共役な像を前記間隙に設ければ、狭い射出光束を得ることができ、一対の光学反射面の間隙で挟まれた領域１０３を小型化できる。
一対の光学反射面の間隙で挟まれた領域１０３を狭くできれば、その領域に開口を有する反射光学系も小型化でき、さらに、保持機構１０４に光線を通すための隙間も一箇所に減らせるので強度が出しやすい。
【００１８】
なお、本実施例では、屈折光学系から反射光学系へ光を入射したが、物体から発せられる光を直接入射しても良いし、別の反射光学系から入射しても良い。
【００１９】
図４は本発明の実施例２をあらわす。符号の説明は実施例１と同様なので省略する。図５は本実施例の光学系の全体図。図６は、像面上のディストーションを表す。
【００２０】
本実施例では反射光学系２０２は、３枚の光学反射面からなり、そのうちの２枚からなる光学反射面の間隙を入射光が通過する。入射光は反射光学系２０２の内部で３回反射し、光線の通過する領域で入射光と光学反射面を入出する反射光線が交差している。反射光学系２０２を射出する光束は、同一の一対の光学反射面の間隙２０３で挟まれた開口２０３を通る、つまり、入射光と同じ間隙を通過する。そのため、反射光学系を保持する保持機構の光線の通す開口が一箇所であり、光学系が小型化できている。
【００２１】
（実施態様１）曲率を有する複数の光学反射面を含む光学系において、
前記光学系に入射する入射光が前記複数の光学反射面のうち隣り合う一対の光学反射面間の間隙を介して前記光学系に入射するとき、前記光学系から出射する出射光も前記間隙を介して前記光学系から出射することを特徴とする光学系。
【００２２】
（実施態様２）前記複数の光学反射面のうち入射光が最初に入射する反射面を入射側反射面、出射光が最後に反射する反射面を出射側反射面としたとき、前記入射側反射面から前記出射側反射面までの光路が少なくとも１回交差していることを特徴とする実施態様１記載の光学系。
【００２３】
（実施態様３）前記入射側反射面から前記出射側反射面までの光路が複数回交差していることを特徴とする実施態様１又は２記載の光学系。
【００２４】
（実施態様４）前記入射側反射面に入射する光もしくは前記出射側反射面から出射する光と、前記入射側反射面から前記出射側反射面までの光路とが４回以上交差することを特徴とする実施態様１乃至３いずれか記載の光学系。
【００２５】
（実施態様５）該光学系に入射する入射光と該光学系から出射する出射光と前記入射側反射面から前記出射側反射面までの光路とが５回以上交差することを特徴とする実施態様１乃至４いずれかに記載の光学系。
【００２６】
（実施態様６）前記光学系は４面の光学反射面を有していることを特徴とする実施態様１乃至５いずれかに記載の光学系。
【００２７】
（実施態様７）前記４面の光学反射面は回転非対称な曲率を有する面であることを特徴とする実施態様６記載の光学系。
【００２８】
（実施態様８）前記複数の光学反射面のうち入射光が最初に入射する反射面を入射側反射面、出射光が最後に反射する光学反射面を出射側反射面とするとき、前記出射側反射面から出射する光もしくは前記出射側反射面から出射する光と、前記入射側反射面から出射側反射面までの光路とが少なくとも１回交差することを特徴とする実施態様１記載の光学系。
【００２９】
（実施態様９）前記光学系は３面の光学反射面を有していることを特徴とする実施態様８に記載の光学系。
【００３０】
（実施態様１０）前記３面の光学反射面は回転非対称な曲率を有する面であることを特徴とする実施態様９記載の光学系。
【００３１】
（実施態様１１）複数の曲率を有する光学反射面を含む結像光学系において、入射光束が光学系へ入射する際に通過する一対の光学反射面の間隙と射出光束が射出する際に通過する一対の光学反射面の間隙を同一にすることを特徴とする光学系。
【００３２】
（実施態様１２）前記入射光束もしくは前記射出光束が間隙をなす反射面と他の反射面で反射することを特徴とする実施態様１１記載の光学系。
【００３３】
（実施態様１３）前記入射光束もしくは前記射出光束が反射光お学系内で複数回交差することを特徴とする実施態様１２記載の光学系。
【００３４】
（実施態様１４）前記入射光束と前記射出光束が交差することを特徴とする実施態様１１記載の光学系。
【００３５】
（実施態様１５）前記光学系への前記入射光束に遮光手段を有することを特徴とする実施態様１１又は１２に記載の光学系。
【００３６】
（実施態様１６）前記光学系からの前記射出光束上に遮光手段と共役な像を有することを特徴とする実施態様１１又は１２に記載の光学系。
【００３７】
（実施態様１７）遮光手段と共役な像を前記間隙に有することを特徴とする実施態様１６記載の光学系。
【００３８】
（実施態様１８）実施態様１乃至１７いずれかに記載の光学系を用いて、表示素子からの光を被投影面に投影することを特徴とする画像投影装置。
【００３９】
【発明の効果】
本発明によれば反射光学系の開口部の数を減らし、大きさを小さくできることで、光学系がコンパクトにでき、保持機構の強度を確保しやすく、高性能な反射光学系を得ることができる。
【図面の簡単な説明】
【図１】本発明の実施例１を説明する図であり、４枚の光学反射面からなる反射光学系の入射光と反射光を通す開口部が同一の反射面の間隙から構成されている。
【図２】実施例１の光学系の全体図である。
【図３】実施例１の光学系の像面上でのディストーションを表す図である。
【図４】本発明の実施例２を説明する図であり、３枚の光学反射面からなる反射光学系の入射光と反射光を通す開口部が同一の反射面の間隙から構成されている。
【図５】実施例２の光学系の全体図である。
【図６】実施例２の光学系の像面上でのディストーションを表す図である。
【図７】従来例の反射光学系を説明する図である。
【符号の説明】
１００，２００ 入射光（不図示）を変調して射出する表示素子
１０１，２０１ 屈折光学系
１０２，２０２ 反射光学系
１０３，２０３ 一対の光学反射面の間隙で反射光学系に光線を入出射させる開口を配置できる領域
１０４，２０４ 保持機構[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projection optical system that projects light from an image forming element such as a liquid crystal panel or DMD onto a projection surface such as a screen, and more particularly to a projection optical system (reflection optical system) having a reflection surface and a projection apparatus having the same. It is.
[0002]
[Prior art]
In order to make a reflecting optical system composed of a plurality of optical reflecting surfaces compact, a proposal has been made in the prior art to shorten the optical path length of the optical system.
[0003]
In Japanese Patent Application Laid-Open No. 2001-222063 (FIG. 7), by using at least three curved reflecting mirrors and appropriately increasing the diagonal length of the screen with respect to the optical path length, the two plane mirrors can be easily folded back. We have proposed a compact rear projection optical system.
[0004]
In Japanese Patent Application Laid-Open No. 2001-221949, a folding mirror is formed by appropriately arranging a ratio of the distance between the screen and the lens system from the final reflecting surface using four reflecting surfaces and securing an optical path length for folding. Therefore, a thin optical system with a small device size in an oblique incidence optical system is proposed.
[0005]
Another technique has been proposed in which a curved mirror is disposed in the optical path to suppress the spread of the optical path inside the optical system and make it compact.
[0006]
For example, in Japanese Patent Application No. 2000-104095, in addition to the three or four aspherical reflecting mirror systems, a spherical reflecting mirror is installed as a reflecting mirror immediately before the screen. We have proposed a reflection projection optical system for rear projection monitors, which consists of reflectors.
[0007]
In the projection optical system disclosed in Japanese Patent Application Laid-Open No. 07-013157, light incident on the first focal point of the ellipsoidal mirror is guided to the second focal point, and the second focal point of the elliptical mirror is focused on the parabolic mirror. An optical system is proposed in which the light guided to the focal point of the tilted parabolic mirror is converted into parallel light and projected obliquely onto the screen.
[0008]
[Patent Document 1]
JP 2001-222063 A [Patent Document 2]
Japanese Patent Laid-Open No. 2001-221949 [Patent Document 3]
JP 2000-104095 A [Patent Document 4]
Japanese Patent Laid-Open No. 07-013157
[Problems to be solved by the invention]
However, as shown in Japanese Patent Application Laid-Open Nos. 2001-2202063, 2001-221949, and Japanese Patent Application No. 2000-104095, even if a plurality of optical reflection surfaces are arranged, the entrance and exit of the light flux is different, so that the reflection optics is different. It is necessary to provide a plurality of apertures for passing the light flux of the element, and there is a disadvantage that the optical system becomes large because the reflection mirrors for the aperture must be spaced apart at a plurality of locations.
[0010]
In addition, in the projection optical system disclosed in Japanese Patent Application Laid-Open No. 07-013157, aberrations occur because rays other than the principal ray do not pass through the first focal point of the ellipsoidal mirror. Aberration occurs at the two focal points, and the image is magnified when entering the parabolic mirror. Therefore, there is a problem that the aberration on the screen is increased and the imaging performance is remarkably deteriorated.
[0011]
Conventionally, an optical system using a plurality of reflecting optical surfaces has a drawback that it is difficult to secure strength because a holding mechanism having at least two gaps for entering and exiting the light beam is required.
[0012]
It is an object of the present invention to provide a pair of optical reflections that pass through a gap between a pair of optical reflecting surfaces that pass when entering the reflecting optical system in an imaging optical system including an optical reflecting surface having a plurality of curvatures. The same gap between the surfaces reduces the number of apertures in the reflective optical system and reduces the size, making the optical system compact and ensuring the strength of the holding mechanism, and high-performance reflective optics. The purpose is to provide a system.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, an image projection apparatus according to a first invention of the present application is an image projection apparatus having a display element and an optical system that projects light from the display element onto a projection surface, The optical system includes an aperture and a reflection optical system that includes first, second, third , and fourth mirrors and reflects a light beam from the aperture, and the light beam from the aperture is connected to the second mirror and the second mirror. The light enters the first mirror through a gap with the three mirrors, the reflected light from the first mirror enters the second mirror through the third mirror and the fourth mirror, and the reflected light from the second mirror. There was incident on the third mirror, the reflected light from the third mirror passes between the first mirror and the second mirror is incident on the fourth mirror, it reflects through the gap reflected light from the fourth mirror optical The reflection optical system is configured to emit from the system, and the reflection optical system forwards the image of the aperture. Gap between the first mirror second mirror, and the said second mirror third gap between the mirrors, characterized in that arranged on one of the gap between the third mirror and the fourth mirror.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Example 1
FIG. 1 shows a first embodiment of the present invention. 100 is a display element that modulates and emits incident light (not shown), 101 is a refracting optical system (not shown), 102 (a dashed-dotted region) is a reflecting optical system, and 103 (between reflecting surfaces surrounded by a dotted line) (Area) indicates an area in which an opening for entering and exiting the light beam to and from the reflection optical system is disposed in the gap between the pair of optical reflection surfaces, and 104 schematically represents the holding mechanism. FIG. 2 is an overall view of the optical system. FIG. 3 shows distortion on the image plane.
[0015]
The light beam emitted from the light source is refracted by the refractive optical system 101 and enters the reflective optical system 102. The reflection optical system 102 includes four optical reflection surfaces, and incident light passes through a gap between the two optical reflection surfaces. The light incident on the reflective optical system 102 is reflected four times inside the reflective optical system 102, and the reflected light intersects the incident light. The light beam emitted from the reflection optical system 102 passes through the opening sandwiched between the gaps 103 of the same pair of optical reflection surfaces, that is, passes through the same gap as the incident light. Therefore, there is one opening through which the light beam of the holding mechanism that holds the reflection optical system passes. The position and size of the aperture may be such that light entering and exiting the reflection optical system is not lost.
[0016]
In this optical system, the exit light beam of the reflection optical system forms a pupil image in the gap 103 between the pair of optical reflection surfaces. Therefore, the cross section in the direction exiting from the reflection optical system can be narrowed by the gap between the optical reflection surfaces. In general, the action of a diaphragm which is a light shielding means in an optical system is a vignetting action which shields a marginal light beam in an off-axis light beam, and a light beam is constricted compared to before and after the diaphragm. In this embodiment, the narrowed pupil image having a conjugate relationship with the stop is disposed in the region 103 sandwiched between the pair of optical reflecting surfaces, so that the pair of optical reflecting surfaces forming the region are arranged. The distance between the surfaces can be shortened, and the reflection optical system can be made compact. Note that if a real image of a pupil is formed on a light beam immediately before entering the reflection optical system, the diameter of the incident light beam can be reduced, and the region 103 sandwiched between the pair of optical reflection surfaces can be reduced in size.
[0017]
Further, if a light beam emitted from the reflection optical system has an image conjugate with the light shielding means, and if an image conjugate with the light shielding means is provided in the gap, a narrow emission light beam can be obtained, and a pair of optical reflections are obtained. The area 103 sandwiched by the gaps between the surfaces can be reduced in size.
If the region 103 sandwiched between the pair of optical reflecting surfaces can be narrowed, the reflecting optical system having an opening in the region can be reduced in size, and the gap for passing the light beam through the holding mechanism 104 can be reduced to one place. Easy to get strength.
[0018]
In this embodiment, light is incident from the refractive optical system to the reflective optical system, but light emitted from the object may be directly incident or may be incident from another reflective optical system.
[0019]
FIG. 4 shows a second embodiment of the present invention. The explanation of the reference numerals is the same as that of the first embodiment, and will be omitted. FIG. 5 is an overall view of the optical system of the present embodiment. FIG. 6 shows distortion on the image plane.
[0020]
In this embodiment, the reflecting optical system 202 is composed of three optical reflecting surfaces, and incident light passes through a gap between the two optical reflecting surfaces. The incident light is reflected three times inside the reflection optical system 202, and the incident light and the reflected light beam entering / exiting the optical reflection surface intersect each other in the region through which the light beam passes. The light beam emitted from the reflection optical system 202 passes through the opening 203 sandwiched by the gap 203 between the same pair of optical reflection surfaces, that is, passes through the same gap as the incident light. Therefore, the opening through which the light beam of the holding mechanism that holds the reflective optical system passes is one place, and the optical system can be downsized.
[0021]
(Embodiment 1) In an optical system including a plurality of optical reflecting surfaces having a curvature,
When incident light incident on the optical system enters the optical system via a gap between a pair of adjacent optical reflecting surfaces of the plurality of optical reflecting surfaces, outgoing light emitted from the optical system also passes through the gap. And an optical system that emits light from the optical system.
[0022]
(Embodiment 2) When the reflecting surface on which incident light first enters among the plurality of optical reflecting surfaces is the incident side reflecting surface, and the reflecting surface on which the outgoing light is finally reflected is the emitting side reflecting surface, the incident side reflection is performed. The optical system according to Embodiment 1, wherein the optical path from the surface to the exit-side reflecting surface intersects at least once.
[0023]
(Embodiment 3) The optical system according to Embodiment 1 or 2, wherein an optical path from the incident-side reflecting surface to the emitting-side reflecting surface intersects a plurality of times.
[0024]
(Embodiment 4) The light incident on the incident-side reflecting surface or the light emitted from the emitting-side reflecting surface and the optical path from the incident-side reflecting surface to the emitting-side reflecting surface intersect four or more times. The optical system according to any one of Embodiments 1 to 3.
[0025]
(Embodiment 5) Implementation characterized in that incident light incident on the optical system, outgoing light emitted from the optical system, and an optical path from the incident-side reflecting surface to the emitting-side reflecting surface intersect five times or more. 5. The optical system according to any one of aspects 1 to 4.
[0026]
(Embodiment 6) The optical system according to any one of Embodiments 1 to 5, wherein the optical system has four optical reflecting surfaces.
[0027]
(Embodiment 7) The optical system according to Embodiment 6, wherein the four optical reflecting surfaces are surfaces having a rotationally asymmetric curvature.
[0028]
(Embodiment 8) When the reflecting surface on which incident light first enters among the plurality of optical reflecting surfaces is the incident side reflecting surface, and the optical reflecting surface on which the outgoing light is reflected last is the emitting side reflecting surface, the emitting side 2. The optical system according to claim 1, wherein the light emitted from the reflecting surface or the light emitted from the emitting side reflecting surface intersects the optical path from the incident side reflecting surface to the emitting side reflecting surface at least once. .
[0029]
(Embodiment 9) The optical system according to Embodiment 8, wherein the optical system has three optical reflecting surfaces.
[0030]
(Embodiment 10) The optical system according to embodiment 9, wherein the three optical reflecting surfaces are surfaces having a rotationally asymmetric curvature.
[0031]
(Embodiment 11) In an imaging optical system including an optical reflecting surface having a plurality of curvatures, a gap between a pair of optical reflecting surfaces that passes when an incident light beam enters the optical system and an emitted light beam pass when the light beam is emitted. An optical system characterized in that the gap between the pair of optical reflecting surfaces is the same.
[0032]
(Embodiment 12) The optical system according to embodiment 11, wherein the incident light beam or the emitted light beam is reflected by a reflecting surface forming a gap and another reflecting surface.
[0033]
(Embodiment 13) The optical system according to embodiment 12, wherein the incident light beam or the emitted light beam intersects the reflected light academic system a plurality of times.
[0034]
(Embodiment 14) The optical system according to embodiment 11, wherein the incident light beam and the outgoing light beam intersect each other.
[0035]
(Embodiment 15) The optical system according to Embodiment 11 or 12, wherein the incident light flux to the optical system has a light shielding means.
[0036]
(Embodiment 16) The optical system according to embodiment 11 or 12, wherein an image conjugate with a light shielding means is formed on the emitted light beam from the optical system.
[0037]
(Embodiment 17) The optical system according to embodiment 16, wherein an image conjugate with the light shielding means is provided in the gap.
[0038]
(Embodiment 18) An image projection apparatus for projecting light from a display element onto a projection surface using the optical system according to any one of Embodiments 1 to 17.
[0039]
【The invention's effect】
According to the present invention, since the number of openings of the reflecting optical system can be reduced and the size can be reduced, the optical system can be made compact, the strength of the holding mechanism can be easily secured, and a high-performance reflecting optical system can be obtained. .
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a first embodiment of the present invention, in which an opening through which incident light and reflected light of a reflection optical system composed of four optical reflection surfaces pass is composed of a gap between the same reflection surfaces; .
2 is an overall view of an optical system according to Example 1. FIG.
FIG. 3 is a diagram illustrating distortion on the image plane of the optical system according to the first exemplary embodiment.
FIG. 4 is a diagram for explaining an embodiment 2 of the present invention, in which an opening for passing incident light and reflected light of a reflecting optical system comprising three optical reflecting surfaces is formed by a gap between the same reflecting surfaces; .
5 is an overall view of an optical system according to Example 2. FIG.
6 is a diagram illustrating distortion on the image plane of the optical system of Example 2. FIG.
FIG. 7 is a diagram illustrating a reflection optical system of a conventional example.
[Explanation of symbols]
100, 200 Display elements 101 and 201 for modulating and emitting incident light (not shown) Refraction optical systems 102 and 202 Reflection optical systems 103 and 203 Apertures that allow light to enter and exit the reflection optical system through a gap between a pair of optical reflection surfaces Area 104,204 holding mechanism

Claims (2)

表示素子と、前記表示素子からの光を被投影面に投影する光学系とを有する画像投影装置であって、
該光学系は、
絞りと、第１、２、３、４ミラーを含み前記絞りからの光束を反射する反射光学系と、を備えており、
前記絞りからの光束が、前記第２ミラーと前記第３ミラーとの間隙を介して前記第１ミラーに入射し、
前記第１ミラーからの反射光が前記第３ミラーと前記第４ミラーとの間を通って前記第２ミラーに入射し、前記第２ミラーからの反射光が前記第３ミラーに入射し、前記第３ミラーからの反射光が前記第１ミラーと前記第２ミラーとの間を通って前記第４ミラーに入射し、前記第４ミラーからの反射光が前記間隙を介して前記反射光学系から射出するように、前記反射光学系が構成されており、
前記反射光学系が、前記絞りの像を前記第１ミラーと前記第２ミラーとの間隙、前記第２ミラーと前記第３ミラーとの間隙、前記第３ミラーと前記第４ミラーとの間隙のいずれかに配置することを特徴とする画像投影装置。 An image projection apparatus comprising: a display element; and an optical system that projects light from the display element onto a projection surface,
The optical system is
A diaphragm, and a reflective optical system that includes first, second, third, and fourth mirrors and reflects a light beam from the diaphragm;
The light beam from the stop is incident on the first mirror through the gap between the second mirror and the third mirror,
The reflected light from the first mirror passes between the third mirror and the fourth mirror and enters the second mirror, and the reflected light from the second mirror enters the third mirror, It enters the fourth mirror passes between the second mirror and the first mirror reflected beam from the third mirror, from said reflecting optical system through the gap reflected light from the fourth mirror The reflective optical system is configured to emit,
The reflective optical system converts the aperture image into a gap between the first mirror and the second mirror, a gap between the second mirror and the third mirror, and a gap between the third mirror and the fourth mirror. An image projection apparatus, which is arranged in any one of them . 前記第１、２、３、４ミラーを保持する保持機構を有することを特徴とする請求項１記載の画像投影装置。The image projection apparatus according to claim 1, further comprising a holding mechanism that holds the first, second, third, and fourth mirrors.
JP2003102805A 2003-04-07 2003-04-07 Reflective optical system and projection apparatus using the same Expired - Fee Related JP4510399B2 (en)

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JP2003102805A JP4510399B2 (en) 2003-04-07 2003-04-07 Reflective optical system and projection apparatus using the same
US10/819,876 US7130114B2 (en) 2003-04-07 2004-04-07 Catoptric optical system
EP04252074A EP1467234B1 (en) 2003-04-07 2004-04-07 Image projector comprising a catoptric optical system
DE602004023028T DE602004023028D1 (en) 2003-04-07 2004-04-07 Image projector with a catoptric optical system

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4681825B2 (en) * 2004-06-08 2011-05-11 キヤノン株式会社 Scanning display optical system
JP2006003637A (en) * 2004-06-17 2006-01-05 Canon Inc Projection optical system and projection-type display device using the same
US20060198018A1 (en) * 2005-02-04 2006-09-07 Carl Zeiss Smt Ag Imaging system
US8128238B2 (en) 2007-09-07 2012-03-06 Ricoh Company, Ltd. Projection optical system and image displaying apparatus
JP5422897B2 (en) 2008-02-27 2014-02-19 株式会社リコー Projection optical system and image display apparatus
JP2020086174A (en) * 2018-11-27 2020-06-04 富士フイルム株式会社 Image formation optical system, projection type display device, and imaging apparatus
JP7433930B2 (en) * 2020-01-24 2024-02-20 キヤノン株式会社 Optical system and imaging device having the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000250137A (en) * 1999-02-26 2000-09-14 Sony Corp Illuminating optical device and projector device
JP2001221949A (en) * 2000-02-07 2001-08-17 Minolta Co Ltd Rear projection optical system
JP2001242381A (en) * 2000-03-01 2001-09-07 Hikari System Kenkyusho:Kk Reflection image optical system for rear projection type monitor
JP2003005074A (en) * 2001-06-26 2003-01-08 Canon Inc Reflection optical system, reflection type optical system and optical apparatus

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5964830A (en) * 1982-10-05 1984-04-12 Canon Inc Illuminating device
US4747678A (en) * 1986-12-17 1988-05-31 The Perkin-Elmer Corporation Optical relay system with magnification
FR2634907B1 (en) * 1988-07-26 1991-10-18 Sagem MULTISPECTRAL MIRROR OPTICAL DEVICE
US5309276A (en) 1991-08-29 1994-05-03 Optical Research Associates Catoptric optical system including concave and convex reflectors
JP2786796B2 (en) 1993-06-23 1998-08-13 シャープ株式会社 projector
US6120156A (en) * 1997-10-16 2000-09-19 Canon Kabushiki Kaisha Optical element and optical system having the same
US6249391B1 (en) 1999-03-11 2001-06-19 Olympus Optical Co., Ltd. Image-forming optical system
JP2001222063A (en) 2000-02-07 2001-08-17 Minolta Co Ltd Rear projection optical system
US6648483B1 (en) * 2000-07-07 2003-11-18 Umax Data Systems, Inc. Concave mirror optical system for scanner
US6758570B2 (en) * 2001-06-26 2004-07-06 Canon Kabushiki Kaisha Reflective optical element, reflective optical system, image display system, and finder optical system
JP4371634B2 (en) * 2002-07-11 2009-11-25 キヤノン株式会社 Imaging optical system and image reading apparatus using the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000250137A (en) * 1999-02-26 2000-09-14 Sony Corp Illuminating optical device and projector device
JP2001221949A (en) * 2000-02-07 2001-08-17 Minolta Co Ltd Rear projection optical system
JP2001242381A (en) * 2000-03-01 2001-09-07 Hikari System Kenkyusho:Kk Reflection image optical system for rear projection type monitor
JP2003005074A (en) * 2001-06-26 2003-01-08 Canon Inc Reflection optical system, reflection type optical system and optical apparatus

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EP1467234B1 (en) 2009-09-09

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